jpeg.h

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#pragma once
 
#include <memory>
 
#include "roo_display/core/device.h"
#include "roo_display/core/drawable.h"
#include "roo_display/image/jpeg/lib/tjpgd.h"
#include "roo_display/image/jpeg/lib/tjpgdcnf.h"
#include "roo_io.h"
#include "roo_io/core/multipass_input_stream.h"
#include "roo_io/core/resource.h"
#include "roo_io/fs/filesystem.h"
#include "roo_logging.h"
 
#ifdef ARDUINO
#include "roo_io/fs/arduino/file_resource.h"
#else
#include "roo_io/fs/file_resource.h"
#endif
 
namespace roo_display {
 
/// JPEG decoder (stateful, reusable).
class JpegDecoder {
 public:
  /// Construct a JPEG decoder instance.
  JpegDecoder();
 
 private:
  friend class JpegImage;
  friend size_t jpeg_read(JDEC*, uint8_t*, size_t);
  friend int jpeg_draw_rect(JDEC* jdec, void* data, JRECT* rect);
 
  bool getDimensions(const roo_io::MultipassResource& resource, int16_t& width,
                     int16_t& height);
 
  bool open(const roo_io::MultipassResource& resource, int16_t& width,
            int16_t& height);
 
  void draw(const roo_io::MultipassResource& resource, const Surface& s,
            uint8_t scale, int16_t& width, int16_t& height);
 
  void close() { input_ = nullptr; }
 
  std::unique_ptr<uint8_t[]> workspace_;
  JDEC jdec_;
 
  std::unique_ptr<roo_io::MultipassInputStream> input_;
  const Surface* surface_;
};
 
/// Drawable JPEG image backed by a multipass resource.
class JpegImage : public Drawable {
 public:
  /// Create a JPEG image using a decoder and resource.
  JpegImage(JpegDecoder& decoder, roo_io::MultipassResource& resource)
      : decoder_(decoder), resource_(resource) {
    decoder_.getDimensions(resource_, width_, height_);
  }
 
  Box extents() const override { return Box(0, 0, width_ - 1, height_ - 1); }
 
 private:
  void drawTo(const Surface& s) const override {
    decoder_.draw(resource_, s, 0, width_, height_);
  }
 
  JpegDecoder& decoder_;
 
  roo_io::MultipassResource& resource_;
  mutable int16_t width_;
  mutable int16_t height_;
};
 
#ifdef ARDUINO
/// Drawable JPEG image backed by a file resource (Arduino).
class JpegFile : public Drawable {
 public:
  /// Create a JPEG file drawable using an Arduino FS and path.
  JpegFile(JpegDecoder& decoder, ::fs::FS& fs, String path)
      : resource_(fs, path.c_str()), img_(decoder, resource_) {}
 
  /// Create a JPEG file drawable using a roo_io filesystem and Arduino String.
  JpegFile(JpegDecoder& decoder, roo_io::Filesystem& fs, String path)
      : resource_(fs, path.c_str()), img_(decoder, resource_) {}
 
  /// Create a JPEG file drawable using a roo_io filesystem and std::string.
  JpegFile(JpegDecoder& decoder, roo_io::Filesystem& fs, std::string path)
      : resource_(fs, std::move(path)), img_(decoder, resource_) {}
 
  Box extents() const override { return img_.extents(); }
 
 private:
  void drawTo(const Surface& s) const override { s.drawObject(img_); }
 
  roo_io::ExtendedArduinoFileResource resource_;
  JpegImage img_;
};
#else
/// Drawable JPEG image backed by a file resource (non-Arduino).
class JpegFile : public Drawable {
 public:
  /// Create a JPEG file drawable using a roo_io filesystem and path.
  JpegFile(JpegDecoder& decoder, roo_io::Filesystem& fs, std::string path)
      : resource_(fs, std::move(path)), img_(decoder, resource_) {}
 
  Box extents() const override { return img_.extents(); }
 
 private:
  void drawTo(const Surface& s) const override { s.drawObject(img_); }
 
  roo_io::FileResource resource_;
  JpegImage img_;
};
#endif
 
}  // namespace roo_display